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Share-based Payments - Additional Information (Detail) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 $ / shares | Feb. 28, 2017 $ / shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | May 31, 2016 $ / shares | Feb. 29, 2016 $ / shares | Mar. 31, 2007 yr shares $ / shares | Dec. 31, 2017 USD ($) yr | Dec. 31, 2016 USD ($) yr | Dec. 31, 2015 USD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 7,400,000 | $ 7,500,000 | $ 4,000,000
Fair value of non-vested stock awards | $ / shares | $ 107.29 | $ 107.29 | $ 59.94 | $ 59.94 | $ 63.30 | $ 59.94 |  |  |  |
Estimated compensation cost for next year |  |  |  |  |  |  |  | $ 9,300,000 | $ 13,100,000 |
Weighted average remaining contractual life | yr |  |  |  |  |  |  |  | 2.1 | 2.8 |
Additional compensation cost recognized |  |  |  |  |  |  |  | $ 0 |  |
Share option expiration period |  |  |  |  |  |  |  | Mar. 31, 2017 |  |
Vesting period |  |  |  |  |  |  |  | 3 years |  |
Expected term |  |  |  |  |  |  |  | 10 years |  |
2017 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Estimated compensation cost for next year |  |  |  |  |  |  |  | $ 4,900,000 |  |
Stock options [member] |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life | yr |  |  |  |  |  |  | 10 |  |  |
Equity stock options granted | shares |  |  |  |  |  |  | 35,657 |  |  |
Exercise price of the options | $ / shares |  |  |  |  |  |  | $ 53.1 |  |  |
Weighted-average fair value of the stock options at the grant date | $ / shares |  |  |  |  |  |  | $ 22.3 |  |  |
Expected dividend yield |  |  |  |  |  |  | 0.58% |  |  |
Expected volatility |  |  |  |  |  |  | 37.80% |  |  |
Weighted average risk-free interest rate |  |  |  |  |  |  | 4.59% |  |  |
Expected term | yr |  |  |  |  |  |  | 6 |  |  |

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- Definition Weighted average fair value at measurement date share options granted per share. + References No definition available. + Details
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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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